FP transport experiments at VTT

Ari Auvinen, Teemu Kärkelä, Jarmo Kalilainen, Pekka Rantanen, Jorma Jokiniemi

Research output: Contribution to conferenceConference articleScientific

Abstract

Phebus FP Programme highlighted some important uncertainties in the transport of especially volatile fission products within the primary circuit during a severe nuclear accident. It was shown that changes in thermal hydraulic and chemical conditions may lead to revaporisation of deposited fission product compounds and their delayed release to the containment. Also the fraction of gaseous iodine found to be released from the circuit was unexpected. A detailed study on the transport of volatile fission products was initiated at VTT during the 4th Framework programme project Revaporisation. Separate effect tests were carried out in order to determine the release of caesium compounds in temperature and flow conditions relevant to severe accidents. During the project a similar facility was constructed at JRC/ITU, where real deposited fission product samples from Phebus FP tests have been studied since then. Since 2009 the effects of reactions on primary circuit surfaces on the transport of gaseous iodine have been conducted using EXSI PC facility at VTT. Thus far samples containing iodine, caesium, molybdenum, boron and silver have been treated in a mixture of argon, steam and hydrogen in temperature between 400 and 650 °C. The tests have enabled to determine the fraction of iodine and other fission products released in gaseous and in aerosol form. The aim of the current test programme is to verify the main factors influencing the gaseous iodine formation within the primary circuit. A further objective is to propose a model for the reactions on primary circuit surfaces that could be incorporated into severe accident codes
Original languageEnglish
Publication statusPublished - 2012
MoE publication typeNot Eligible
EventPhébus FP final seminar - Aix-en-Provence, France
Duration: 13 Jun 201215 Jun 2012

Conference

ConferencePhébus FP final seminar
CountryFrance
CityAix-en-Provence
Period13/06/1215/06/12

Fingerprint

Fission products
Iodine
Networks (circuits)
Accidents
Experiments
Cesium compounds
Cesium
Molybdenum
Aerosols
Boron
Argon
Silver
Steam
Hydraulics
Hydrogen
Temperature

Cite this

Auvinen, A., Kärkelä, T., Kalilainen, J., Rantanen, P., & Jokiniemi, J. (2012). FP transport experiments at VTT. Paper presented at Phébus FP final seminar, Aix-en-Provence, France.
Auvinen, Ari ; Kärkelä, Teemu ; Kalilainen, Jarmo ; Rantanen, Pekka ; Jokiniemi, Jorma. / FP transport experiments at VTT. Paper presented at Phébus FP final seminar, Aix-en-Provence, France.
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Auvinen, A, Kärkelä, T, Kalilainen, J, Rantanen, P & Jokiniemi, J 2012, 'FP transport experiments at VTT' Paper presented at Phébus FP final seminar, Aix-en-Provence, France, 13/06/12 - 15/06/12, .

FP transport experiments at VTT. / Auvinen, Ari; Kärkelä, Teemu; Kalilainen, Jarmo; Rantanen, Pekka; Jokiniemi, Jorma.

2012. Paper presented at Phébus FP final seminar, Aix-en-Provence, France.

Research output: Contribution to conferenceConference articleScientific

TY - CONF

T1 - FP transport experiments at VTT

AU - Auvinen, Ari

AU - Kärkelä, Teemu

AU - Kalilainen, Jarmo

AU - Rantanen, Pekka

AU - Jokiniemi, Jorma

N1 - Project code: TRAFI 73927

PY - 2012

Y1 - 2012

N2 - Phebus FP Programme highlighted some important uncertainties in the transport of especially volatile fission products within the primary circuit during a severe nuclear accident. It was shown that changes in thermal hydraulic and chemical conditions may lead to revaporisation of deposited fission product compounds and their delayed release to the containment. Also the fraction of gaseous iodine found to be released from the circuit was unexpected. A detailed study on the transport of volatile fission products was initiated at VTT during the 4th Framework programme project Revaporisation. Separate effect tests were carried out in order to determine the release of caesium compounds in temperature and flow conditions relevant to severe accidents. During the project a similar facility was constructed at JRC/ITU, where real deposited fission product samples from Phebus FP tests have been studied since then. Since 2009 the effects of reactions on primary circuit surfaces on the transport of gaseous iodine have been conducted using EXSI PC facility at VTT. Thus far samples containing iodine, caesium, molybdenum, boron and silver have been treated in a mixture of argon, steam and hydrogen in temperature between 400 and 650 °C. The tests have enabled to determine the fraction of iodine and other fission products released in gaseous and in aerosol form. The aim of the current test programme is to verify the main factors influencing the gaseous iodine formation within the primary circuit. A further objective is to propose a model for the reactions on primary circuit surfaces that could be incorporated into severe accident codes

AB - Phebus FP Programme highlighted some important uncertainties in the transport of especially volatile fission products within the primary circuit during a severe nuclear accident. It was shown that changes in thermal hydraulic and chemical conditions may lead to revaporisation of deposited fission product compounds and their delayed release to the containment. Also the fraction of gaseous iodine found to be released from the circuit was unexpected. A detailed study on the transport of volatile fission products was initiated at VTT during the 4th Framework programme project Revaporisation. Separate effect tests were carried out in order to determine the release of caesium compounds in temperature and flow conditions relevant to severe accidents. During the project a similar facility was constructed at JRC/ITU, where real deposited fission product samples from Phebus FP tests have been studied since then. Since 2009 the effects of reactions on primary circuit surfaces on the transport of gaseous iodine have been conducted using EXSI PC facility at VTT. Thus far samples containing iodine, caesium, molybdenum, boron and silver have been treated in a mixture of argon, steam and hydrogen in temperature between 400 and 650 °C. The tests have enabled to determine the fraction of iodine and other fission products released in gaseous and in aerosol form. The aim of the current test programme is to verify the main factors influencing the gaseous iodine formation within the primary circuit. A further objective is to propose a model for the reactions on primary circuit surfaces that could be incorporated into severe accident codes

M3 - Conference article

ER -

Auvinen A, Kärkelä T, Kalilainen J, Rantanen P, Jokiniemi J. FP transport experiments at VTT. 2012. Paper presented at Phébus FP final seminar, Aix-en-Provence, France.